I was told somewhere…by someone…that if you are in the outside lane, and Doddering Derek is in the middle lane, you can continue past him if he is not doing the national limit. However, if you were behind him, moved left, passed then moved back into the middle lane, that would be illegal.
Personally I just pass them if I have to, I really wouldn’t want to have to spend all day driving up a motorway at 45mph due to some total idiot in the middle lane…
Seem to remember on one of the Cop TV car chase extravaganza programs they only class it as an illegal overtake if you are using the same lane as the slower vehicle, and then pull back into the same lane after using an inside lane to pass.
That motorcyclist won’t be around for long, if he’s riding in ignorance of whats happening around him.
On a motorcycle you have to consider every possible move by any vehicles around you or you are history and I’ve heard many argue from a hospital bed that they were in the right, the other vehicle was to blame 